from sqlalchemy import create_engine, Table, Column, ForeignKey, String, Integer, DateTime
import sqlalchemy.sql.functions as func
from sqlalchemy_utc import UtcDateTime, utcnow
from wtforms_alchemy import ModelForm

from app.sql.common import db, Base, Session

from app.utils.file_utils import sha256_tree
from app.settings import app_cfg

from os.path import join

class Upload(Base):
  """Table for storing references to various media"""
  __tablename__ = 'upload'
  id = Column(Integer, primary_key=True)
  graph_id = Column(Integer, ForeignKey('graph.id'), nullable=True)
  sha256 = Column(String(256), nullable=False)
  fn = Column(String(256), nullable=False)
  ext = Column(String(4, convert_unicode=True), nullable=False)
  tag = Column(String(64, convert_unicode=True), nullable=True)
  username = Column(String(16, convert_unicode=True), nullable=False)
  created_at = Column(UtcDateTime(), default=utcnow())

  def toJSON(self):
    return {
      'id': self.id,
      'graph_id': self.graph_id,
      'sha256': self.sha256,
      'fn': self.fn,
      'ext': self.ext,
      'tag': self.tag,
      'username': self.username,
      'url': self.url(),
      'created_at': self.created_at,
    }

  def url(self):
    if self.tag:
      return join('/static/uploads', str(self.graph_id), self.tag, self.fn)
    return join('/static/uploads', str(self.graph_id), self.fn)